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• Octal

Nat-to-oct-string

Convert a natural number into a string with its octal digits.

Signature

(nat-to-oct-string n) → str

Arguments

n — Guard (natp n).

Returns

str — Type (stringp str).

For instance, (nat-to-oct-string 15) is "17".

Definitions and Theorems

Function: nat-to-oct-string$inline

(defun nat-to-oct-string$inline (n)
  (declare (xargs :guard (natp n)))
  (let ((acl2::__function__ 'nat-to-oct-string))
    (declare (ignorable acl2::__function__))
    (implode (nat-to-oct-chars n))))

Theorem: stringp-of-nat-to-oct-string

(defthm stringp-of-nat-to-oct-string
  (b* ((str (nat-to-oct-string$inline n)))
    (stringp str))
  :rule-classes :type-prescription)

Theorem: oct-digit-char-list*p-of-nat-to-dec-string

(defthm oct-digit-char-list*p-of-nat-to-dec-string
  (oct-digit-char-list*p (explode (nat-to-oct-string n))))

Theorem: nat-to-oct-string-one-to-one

(defthm nat-to-oct-string-one-to-one
  (equal (equal (nat-to-oct-string n)
                (nat-to-oct-string m))
         (equal (nfix n) (nfix m))))

Theorem: oct-digit-chars-value-of-nat-to-dec-string

(defthm oct-digit-chars-value-of-nat-to-dec-string
  (equal (oct-digit-chars-value (explode (nat-to-oct-string n)))
         (nfix n)))

Theorem: nat-to-oct-string-nonempty

(defthm nat-to-oct-string-nonempty
  (not (equal (nat-to-oct-string n) "")))